﻿710 
  Transactions 
  South 
  African 
  Philosophical 
  Society, 
  [vol. 
  xii. 
  

  

  of 
  the 
  pygidium, 
  the 
  segments 
  are 
  very 
  compressed 
  underneath 
  and 
  

   soldered, 
  in 
  the 
  female 
  the 
  abdomen 
  is 
  convex 
  ; 
  the 
  anterior 
  tibiae 
  are 
  

   tri-dentate 
  (Heterochelus) 
  or 
  quadri-dentate 
  (Ischnochelus) 
  ; 
  in 
  the 
  

   first 
  group 
  the 
  two 
  basal 
  teeth 
  are 
  either 
  connate 
  at 
  the 
  base 
  or 
  set 
  

   very 
  close 
  to 
  each 
  other, 
  at 
  right 
  angles 
  to 
  the 
  tibia, 
  very 
  sharp, 
  

   long, 
  and 
  almost 
  always 
  distinctly 
  bending 
  downwards, 
  and 
  the 
  

   apical 
  tooth 
  is 
  more 
  oblique 
  than 
  the 
  other 
  two 
  and 
  assumes 
  the 
  

   same 
  shape, 
  there 
  is 
  occasionally 
  a 
  distinct 
  angle 
  above 
  the 
  basal 
  

   tooth, 
  and 
  in 
  Ischnochelus 
  this 
  angle 
  has 
  been 
  developed 
  into 
  a 
  tooth 
  

   often 
  nearly 
  the 
  same 
  shape 
  and 
  size 
  as 
  the 
  basal 
  one, 
  but 
  in 
  

   I. 
  bi-partitus 
  this 
  tooth, 
  although 
  very 
  distinct, 
  is 
  broader 
  and 
  more 
  

   triangular 
  than 
  the 
  one 
  following, 
  there 
  is 
  no 
  inner 
  spur 
  in 
  either 
  

   sex 
  ; 
  the 
  claws 
  of 
  the 
  fore 
  legs 
  are 
  double, 
  unequal, 
  and 
  the 
  longer 
  

   one 
  is 
  always 
  cleft, 
  that 
  of 
  the 
  intermediate 
  legs 
  is 
  in 
  most 
  cases 
  

   double 
  and 
  both 
  sides 
  are 
  cleft, 
  but 
  in 
  several 
  cases 
  the 
  smaller 
  

   inner 
  one 
  has 
  disappeared 
  (H. 
  lugens, 
  &c), 
  those 
  of 
  the 
  hind 
  legs 
  

   are 
  either 
  double 
  with 
  the 
  inner 
  claw 
  always 
  smaller 
  than 
  the 
  

   outer, 
  pressed 
  against 
  it, 
  and 
  cleft, 
  the 
  larger 
  one 
  being 
  cleft 
  or 
  not, 
  

   or 
  single 
  and 
  simple, 
  or 
  cleft 
  ; 
  the 
  difference 
  in 
  the 
  shape 
  of 
  the 
  

   claws 
  has 
  no 
  generic 
  value 
  whatever, 
  but 
  is 
  very 
  useful 
  in 
  discrimi- 
  

   nating 
  between 
  many 
  species 
  ; 
  the 
  intermediate 
  tibiae 
  have 
  an 
  apical 
  

   spur, 
  and 
  the 
  posterior 
  ones 
  have 
  one 
  or 
  are 
  without 
  ; 
  when 
  the 
  

   mucronate 
  part 
  of 
  the 
  hind 
  tibiae 
  of 
  the 
  male 
  is 
  very 
  greatly 
  

   developed, 
  this 
  spur 
  disappears 
  completely, 
  but 
  there 
  are 
  exceptions 
  

   (H. 
  femoralis, 
  unguiculatus 
  , 
  chiragricus, 
  padagricus, 
  insignis, 
  &c.) 
  ; 
  

   in 
  the 
  female 
  this 
  spur 
  is 
  always 
  present 
  ; 
  in 
  the 
  male 
  the 
  hind 
  

   femora 
  are 
  very 
  robust, 
  or 
  robust, 
  seldom 
  slender 
  (nubilus, 
  dissidens), 
  

   in 
  some 
  species 
  of 
  the 
  division 
  Ischnochelus 
  armed 
  with 
  a 
  long 
  spine 
  on 
  

   the 
  trochanters 
  or 
  not, 
  and 
  sometimes 
  with 
  an 
  inward 
  tooth 
  near 
  the 
  

   knee, 
  the 
  tibiae 
  are 
  generally 
  curved, 
  hollowed 
  underneath, 
  carinate 
  

   or 
  compressed, 
  in 
  most 
  cases 
  serrate 
  or 
  dentate, 
  strongly 
  mucronate 
  

   at 
  apex 
  or 
  not, 
  the 
  articulation 
  of 
  the 
  knee 
  of 
  the 
  femur 
  may 
  be 
  

   developed 
  into 
  an 
  angular 
  process 
  turning 
  sometimes 
  into 
  a 
  spine, 
  in 
  

   this 
  case 
  the 
  basal 
  part 
  of 
  the 
  tibiae 
  is 
  more 
  or 
  less 
  deeply 
  emarginate 
  

   or 
  incised 
  inwardly, 
  and 
  when 
  it 
  is 
  scooped 
  underneath, 
  there 
  is 
  close 
  

   to 
  that 
  emargination 
  or 
  semicircular 
  impression, 
  a 
  more 
  or 
  less 
  sharp 
  

   tooth 
  either 
  on 
  each 
  side 
  or 
  on 
  one 
  side 
  only. 
  The 
  female 
  has 
  a 
  

   more 
  modest 
  livery 
  than 
  the 
  male, 
  the 
  hind 
  legs 
  are 
  simple 
  or 
  not 
  

   unduly 
  thickened 
  ; 
  whenever 
  they 
  have 
  scales 
  these 
  are 
  more 
  like 
  

   squamose 
  hairs, 
  but 
  there 
  are 
  some 
  exceptions. 
  

  

  The 
  genus, 
  as 
  now 
  restricted, 
  includes 
  94 
  species, 
  10 
  of 
  which 
  I 
  

   have 
  not 
  been 
  able 
  to 
  identify 
  ; 
  of 
  these 
  one 
  does 
  probably 
  not 
  

   belong 
  to 
  the 
  genus. 
  

  

  